Publications associées à Stellar corona

Impact of microwave beam scattering by density fluctuations on the electron-cyclotron power deposition profile in tokamaks

Stefano Coda, Joan Decker, Oleg Krutkin, Umesh Kumar, Jean Arthur Cazabonne

Electron-cyclotron waves are a tool commonly used in tokamaks, in particular to drive current. Their ability to drive current in a very localized manner renders them an optimal tool for MHD mode mitigation. However, such applications require high accuracy ...

Bristol2024

Nonlinear interaction of Alfvénic instabilities and turbulence via the modification of the equilibrium profiles

Laurent Villard, Alberto Bottino, Xiao Wang

Nonlinear simulations of Alfvén modes (AMs) driven by energetic particles (EPs) in the presence of turbulence are performed with the gyrokinetic particle-in-cell code ORB5. The AMs carry a heat flux, and consequently they nonlinearly modify the plasma temp ...

2023

Gyrokinetic simulation of low-n Alfvenic modes in tokamak HL-2A plasmas

Javier García Hernández, Samuele Mazzi

The turbulence characteristics of plasmas with internal transport barriers in the HL-2A tokamak are analyzed by means of linear gyrokinetic simulations. It is found that turbulence is dominated by the ion temperature gradient (ITG) mode together with large ...

2023

Excitation of toroidal Alfvén eigenmodes with counter-current NBI in the TCV tokamak

Laurie Porte, Alexander Karpushov, Matteo Vallar, Samuele Mazzi

In TCV, unstable modes excited by resonant interaction between the shear Alfvèn waves in con- tinuum gaps and energetic particles have been observed in scenarios with Neutral Beam Injection (NBI). TCV is a middle-size device (R 0 /a = 0.88/0.25) equipped w ...

2023

Present design of the Steering Mirror Assembly (SMA) for ITER ECHUL

Timothy Goodman, René Chavan, Anastasia Xydou

In the ITER Tokamak, four Electron Cyclotron Heating Upper Launchers (ECHUL) are needed to control plasma instabilities at the rational surfaces, most importantly the q = 3/2 and q = 2/1 neoclassical tearing modes (NTMs). Each ECHUL is equipped with a set ...

ELSEVIER SCIENCE SA2023

How accurate are flux-tube (local) gyrokinetic codes in modeling energetic particle effects on core turbulence?

Olivier Sauter, Alberto Bottino, Emanuele Poli

Flux-tube (local) gyrokinetic codes are widely used to simulate drift-wave turbulence in magnetic confinement devices. While a large number of studies show that flux-tube codes provide an excellent approximation for turbulent transport in medium-large devi ...

IOP Publishing Ltd2023

Solar Wind Protons in the Diamagnetic Cavity at Comet 67P/Churyumov-Gerasimenko

Lucie Anemone Scharré

The plasma environment at a comet can be divided into different regions with distinct plasma characteristics. Two such regions are the solar wind ion cavity, which refers to the part of the outer coma that does not contain any solar wind ions anymore; and ...

AMER GEOPHYSICAL UNION2023

Full conversion from ohmic to runaway electron driven current via massive gas injection in the TCV tokamak

Olivier Sauter, Basil Duval, Stefano Coda, Patrick Blanchard, Benoît Labit, Joan Decker, Umar Sheikh, Cristian Galperti, Gergely Papp

Full conversion from ohmic to runaway electron (RE) driven current was observed in the tokamak a configuration variable (TCV) following massive injection of neon through a disruption mitigation valve into a low-density limited circular plasma. Following a ...

IOP Publishing Ltd2022

The Alfvenic nature of chromospheric swirls

Aleksi Antoine Bossart, Andrea Francesco Battaglia

Context. Observations show that small-scale vortical plasma motions are ubiquitous in the quiet solar atmosphere. They have received increasing attention in recent years because they are a viable candidate mechanism for the heating of the outer solar atmos ...

EDP SCIENCES S A2021

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Stellar corona

Impact of microwave beam scattering by density fluctuations on the electron-cyclotron power deposition profile in tokamaks

Nonlinear interaction of Alfvénic instabilities and turbulence via the modification of the equilibrium profiles

Gyrokinetic simulation of low-n Alfvenic modes in tokamak HL-2A plasmas

Excitation of toroidal Alfvén eigenmodes with counter-current NBI in the TCV tokamak

Present design of the Steering Mirror Assembly (SMA) for ITER ECHUL

How accurate are flux-tube (local) gyrokinetic codes in modeling energetic particle effects on core turbulence?

Solar Wind Protons in the Diamagnetic Cavity at Comet 67P/Churyumov-Gerasimenko

On the Ohmic-dominant heating mode of capacitively coupled plasma inverted by boundary electron emission

Full conversion from ohmic to runaway electron driven current via massive gas injection in the TCV tokamak

The Alfvenic nature of chromospheric swirls

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Chattez avec Graph Search

Impact of microwave beam scattering by density fluctuations on the electron-cyclotron power deposition profile in tokamaks

Nonlinear interaction of Alfvénic instabilities and turbulence via the modification of the equilibrium profiles

Gyrokinetic simulation of low-n Alfvenic modes in tokamak HL-2A plasmas

Excitation of toroidal Alfvén eigenmodes with counter-current NBI in the TCV tokamak

Solar Wind Protons in the Diamagnetic Cavity at Comet 67P/Churyumov-Gerasimenko

Full conversion from ohmic to runaway electron driven current via massive gas injection in the TCV tokamak

Present design of the Steering Mirror Assembly (SMA) for ITER ECHUL

How accurate are flux-tube (local) gyrokinetic codes in modeling energetic particle effects on core turbulence?

On the Ohmic-dominant heating mode of capacitively coupled plasma inverted by boundary electron emission

The Alfvenic nature of chromospheric swirls